Trade board (4)
I believe the answer is:
Here is my best explanation:
This clue is a double definition.
'trade' is the first definition.
('deal' can be a synonym of 'trade')
'board' is the second definition.
(deal is a kind of board)
(Other definitions for deal that I've seen before include "Wood - piece of business", "Trade; soft wood", "A port, a bargain", "Transact", "Lead out of the pine wood", "Timber - trade", "Plank of softwood timber", "Trade; pine wood", "Transaction" and "Hand out playing cards".)